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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Segment Reporting Information, Profit (Loss) |  |  |  |  |
Revenues | $ 194,093 | $ 141,369 |  | $ 533,035 | $ 391,153
Gross profit | 43,843 | 21,864 |  | 98,458 | 72,605
Income before income taxes | 18,279 | 1,195 | 1,195 | 30,120 | 8,177
Depreciation and amortization expense | 3,387 | 3,990 |  | 9,814 | 11,448
Electrical Power Products [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) |  |  |  |  |
Revenues | 186,272 | 134,425 |  | 510,910 | 370,143
Gross profit | 41,677 | 19,788 |  | 93,203 | 67,236
Income before income taxes | 18,422 | 1,055 |  | 30,066 | 8,567
Depreciation and amortization expense | 3,365 | 3,951 |  | 9,779 | 11,325
Process Control Systems [Member] |  |  |  |  |
Segment Reporting Information, Profit (Loss) |  |  |  |  |
Revenues | 7,821 | 6,944 |  | 22,125 | 21,010
Gross profit | 2,166 | 2,076 |  | 5,255 | 5,369
Income before income taxes | (143) | 140 |  | 54 | (390)
Depreciation and amortization expense | $ 22 | $ 39 |  | $ 35 | $ 123

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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